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                    5.8 话题排序
            
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                    第六章 话题开发
            
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                    6.1 新建话题
            
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                                <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><li><span class="title-icon "></span><a href="#58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><b></b>5.8 &#x8BDD;&#x9898;&#x6392;&#x5E8F;</a></li><ul><li><span class="title-icon "></span><a href="#&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><b></b>&#x8BDD;&#x9898;&#x6392;&#x5E8F;</a></li><li><span class="title-icon "></span><a href="#1-&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;"><b></b>1. &#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;</a></li><li><span class="title-icon "></span><a href="#2-&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;"><b></b>2. &#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;</a></li><li><span class="title-icon "></span><a href="#3-&#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;"><b></b>3. &#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;</a></li></ul></ul></div><a href="#58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;" id="anchorNavigationExGoTop"><i class="fa fa-arrow-up"></i></a><h1 id="58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><a name="58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;" class="anchor-navigation-ex-anchor" href="#58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;" class="plugin-anchor" href="#58-&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><i class="fa fa-link" aria-hidden="true"></i></a>5.8 &#x8BDD;&#x9898;&#x6392;&#x5E8F;</h1>
<h2 id="&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><a name="&#x8BDD;&#x9898;&#x6392;&#x5E8F;" class="anchor-navigation-ex-anchor" href="#&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="&#x8BDD;&#x9898;&#x6392;&#x5E8F;" class="plugin-anchor" href="#&#x8BDD;&#x9898;&#x6392;&#x5E8F;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x8BDD;&#x9898;&#x6392;&#x5E8F;</h2>
<p>&#x6211;&#x4EEC;&#x73B0;&#x5728;&#x6765;&#x5B9E;&#x73B0;&#xFF0C;&#x6700;&#x540E;&#x56DE;&#x590D;&#x548C;&#x6700;&#x65B0;&#x53D1;&#x5E03;&#x6392;&#x5E8F;&#x529F;&#x80FD;:
&#x8003;&#x8651;&#x5230;&#x5728;&#x5206;&#x7C7B;&#x4E0B;&#x7684;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x4E5F;&#x4F1A;&#x7528;&#x5230;&#x6392;&#x5E8F;&#xFF0C;&#x800C;&#x4E14;&#x662F;&#x5728;&#x4E0D;&#x52A8;&#x63A7;&#x5236;&#x5668;&#x4E2D;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x5C06;&#x6392;&#x5E8F;&#x903B;&#x8F91;&#x653E;&#x5728;
Topic&#x6570;&#x636E;&#x6A21;&#x578B;&#x4E2D;&#x3002;</p>
<p>&#x63A5;&#x4E0B;&#x6765;&#x7684;&#x6B65;&#x9AA4;:</p>
<ul>
<li>Topic&#x4E2D;&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;</li>
<li>TopicsController&#x63A7;&#x5236;&#x5668;&#x8C03;&#x7528;</li>
<li>CategoriesController&#x63A7;&#x5236;&#x5668;&#x8C03;&#x7528;</li>
</ul>
<h2 id="1-&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;"><a name="1-&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;" class="anchor-navigation-ex-anchor" href="#1-&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="1-&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;" class="plugin-anchor" href="#1-&#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;"><i class="fa fa-link" aria-hidden="true"></i></a>1. &#x7F16;&#x5199;&#x6392;&#x5E8F;&#x903B;&#x8F91;</h2>
<pre><code>&#x279C; kaleo@zhou  ~/Code/kaleobbs git:(master) vim app/Models/Topic.php
</code></pre><p>&#x5185;&#x5BB9;:</p>
<pre><code>&lt;?php

namespace App\Models;

class Topic extends Model
{
    protected $fillable = [&apos;title&apos;, &apos;body&apos;, &apos;user_id&apos;, &apos;category_id&apos;, &apos;reply_count&apos;, &apos;view_count&apos;, &apos;last_reply_user_id&apos;, &apos;order&apos;, &apos;excerpt&apos;, &apos;slug&apos;];

    public function category()
    {
        return $this-&gt;belongsTo(Category::class);
    }
    public function user()
    {
        return $this-&gt;belongsTo(User::class);
    }
    //&#x6392;&#x5E8F;&#x903B;&#x8F91;
    public function scopeWithOrder($query,$order){
        //&#x4E0D;&#x540C;&#x7684;&#x6392;&#x5E8F;&#xFF0C;&#x4F7F;&#x7528;&#x4E0D;&#x540C;&#x7684;&#x6570;&#x636E;&#x8BFB;&#x53D6;&#x903B;&#x8F91;
        switch ($order) {
            case &apos;recent&apos;:
                //&#x6700;&#x65B0;&#x53D1;&#x5E03;
                $query-&gt;recent();
                break;

            default:
                //&#x6700;&#x540E;&#x56DE;&#x590D;
                $query-&gt;recentReplied();
                break;
        }
        //&#x9884;&#x52A0;&#x8F7D;&#x653E;&#x7F6E;&#x91CD;&#x590D;sql&#x67E5;&#x8BE2;&#x95EE;&#x9898;
        return $query-&gt;with(&apos;user&apos;,&apos;category&apos;);
    }
    public function scopeRecentReplied($query){
        //&#x5F53;&#x8BDD;&#x9898;&#x6709;&#x65B0;&#x56DE;&#x590D;&#x65F6;&#xFF0C;&#x6211;&#x4EEC;&#x5C06;&#x7F16;&#x5199;&#x903B;&#x8F91;&#x6765;&#x66F4;&#x65B0;&#x8BDD;&#x9898;&#x6A21;&#x578B;&#x7684;reply_count&#x5C5E;&#x6027;
        //&#x6B64;&#x65F6;&#x4F1A;&#x81EA;&#x52A8;&#x89E6;&#x53D1;&#x6846;&#x67B6;&#x5BF9;&#x6570;&#x636E;&#x6A21;&#x578B;updated_at&#x65F6;&#x95F4;&#x6233;&#x66F4;&#x65B0;
        return $query-&gt;orderBy(&apos;updated_at&apos;,&apos;desc&apos;);
    }
    public function scopeRecent($query){
        //&#x6309;&#x7167;&#x521B;&#x5EFA;&#x4E8B;&#x4EF6;&#x6392;&#x5E8F;
        return $query-&gt;orderBy(&apos;created_at&apos;,&apos;desc&apos;);
    }
}
</code></pre><p>&#x8FD9;&#x91CC;&#x6211;&#x4EEC;&#x4F7F;&#x7528;&#x4E86;Laravel&#x672C;&#x5730;&#x4F5C;&#x7528;&#x57DF;&#x3002;&#x672C;&#x5730;&#x4F5C;&#x7528;&#x57DF;&#x5141;&#x8BB8;&#x6211;&#x4EEC;&#x5B9A;&#x4E49;&#x901A;&#x7528;&#x7684;&#x7EA6;&#x675F;&#x96C6;&#x5408;&#xFF0C;&#x4EE5;&#x4FBF;&#x5728;&#x5E94;&#x7528;&#x4E2D;&#x670D;&#x7528;&#x3002;&#x8981;&#x5B9A;&#x4E49;&#x8FD9;&#x6837;&#x7684;&#x4E00;&#x4E2A;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x53EA;&#x9700;&#x7B80;&#x5355;&#x7684;&#x5728;&#x5BF9;&#x5E94;&#x7684;Eloquent&#x6A21;&#x578B;&#x65B9;&#x6CD5;&#x524D;&#x52A0;&#x4E0A;scope&#x524D;&#x7F00;&#xFF0C;
&#x4F5C;&#x7528;&#x57DF;&#x603B;&#x662F;&#x8FD4;&#x56DE;&#x3010;&#x67E5;&#x8BE2;&#x6784;&#x5EFA;&#x5668;&#x3011;&#xFF0C;&#x4E00;&#x65E6;&#x5B9A;&#x4E49;&#x4E86;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x5219;&#x53EF;&#x4EE5;&#x5728;&#x67E5;&#x8BE2;&#x6A21;&#x578B;&#x65F6;&#x8C03;&#x7528;&#x4F5C;&#x7528;&#x57DF;&#x65B9;&#x6CD5;&#x3002;&#x5728;&#x8FDB;&#x884C;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x65F6;&#x4E0D;&#x7528;&#x52A0;&#x4E0A;scope&#x524D;&#x7F00;&#xFF0C;&#x5982;&#x4E0A;&#x9762;&#x3002;</p>
<h2 id="2-&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;"><a name="2-&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;" class="anchor-navigation-ex-anchor" href="#2-&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="2-&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;" class="plugin-anchor" href="#2-&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;"><i class="fa fa-link" aria-hidden="true"></i></a>2. &#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;</h2>
<pre><code>&#x279C; kaleo@zhou  ~/Code/kaleobbs git:(master) &#x2717; vim app/Http/Controllers/TopicsController.php
</code></pre><p>&#x5185;&#x5BB9;:</p>
<pre><code>.
.
.

public function index(Request $request,Topic $topic)
{
    $topics = $topic-&gt;withOrder($request-&gt;order)-&gt;paginate();
    return view(&apos;topics.index&apos;, compact(&apos;topics&apos;));
}

.
.
.
</code></pre><p>&#x4FEE;&#x6539;&#x6A21;&#x677F;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x4E3A;&#x6309;&#x94AE;&#x6DFB;&#x52A0;&#x8FDE;&#x63A5;&#x548C;&#x9009;&#x4E2D;&#x72B6;&#x6001;</p>
<pre><code>&#x279C; kaleo@zhou  ~/Code/kaleobbs git:(master) &#x2717; vim resources/views/topics/index.blade.php
</code></pre><p>&#x5185;&#x5BB9;:</p>
<pre><code>.
.
.
&lt;li class=&quot;nav-item&quot;&gt;&lt;a class=&quot;nav-link {{active_class( ! if_query(&apos;order&apos;,&apos;recent&apos;))}}&quot; href=&quot;{{Request::url()}}?order=default&quot;&gt;&#x6700;&#x540E;&#x56DE;&#x590D;&lt;/a&gt;&lt;/li&gt;
&lt;li class=&quot;nav-item&quot;&gt;&lt;a class=&quot;nav-link {{active_class(if_query(&apos;order&apos;,&apos;recent&apos;))}}&quot; href=&quot;{{Request::url()}}?order=recent&quot;&gt;&#x6700;&#x65B0;&#x53D1;&#x5E03;&lt;/a&gt;&lt;/li&gt;
.
.
.
</code></pre><p>&#x67E5;&#x770B;&#x6548;&#x679C;:
<img src="http://images.kaleozhou.top/5.8-01.gif" alt="5.8-01.gif"></p>
<h2 id="3-&#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;"><a name="3-&#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;" class="anchor-navigation-ex-anchor" href="#3-&#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="3-&#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;" class="plugin-anchor" href="#3-&#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;"><i class="fa fa-link" aria-hidden="true"></i></a>3. &#x5206;&#x7C7B;&#x8BDD;&#x9898;&#x5217;&#x8868;&#x6392;&#x5E8F;</h2>
<p>&#x63A5;&#x4E0B;&#x6765;&#x6211;&#x4EEC;&#x5728;&#x5206;&#x7C7B;&#x63A7;&#x5236;&#x5668;&#x4E2D;&#x8C03;&#x7528;&#x65B9;&#x6CD5;:</p>
<pre><code>&#x279C; kaleo@zhou  ~/Code/kaleobbs git:(master) &#x2717; vim app/Http/Controllers/CategoriesController.php
</code></pre><p>&#x5185;&#x5BB9;:</p>
<pre><code>&lt;?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Topic;
use App\Models\Category;

class CategoriesController extends Controller
{
    public function show(Category $category,Request $request,Topic $topic){
        //&#x8BFB;&#x53D6;&#x5206;&#x7C7B;ID&#x5173;&#x8054;&#x7684;&#x8BDD;&#x9898;&#xFF0C;&#x5E76;&#x6309;&#x6BCF;15&#x6761;&#x5206;&#x9875;
        $topics=$topic-&gt;withOrder($request-&gt;order)
            -&gt;where(&apos;category_id&apos;,$category-&gt;id)
            -&gt;paginate();
        //&#x4F20;&#x53C2;&#x53D8;&#x91CF;&#x8BDD;&#x9898;&#x548C;&#x5206;&#x7C7B;&#x5230;&#x6A21;&#x677F;&#x4E2D;
        return view(&apos;topics.index&apos;,compact(&apos;topics&apos;,&apos;category&apos;));
    }
}
</code></pre><p>&#x67E5;&#x770B;&#x6548;&#x679C;:
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